In-line keyboard for musical instrument



FIG. 1 is a top view of an in-line keyboard for musical instrument showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a rear view thereof.

The broken line in FIGS. 1-5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a in-line keyboard for musical instrument, as shown and described. 